Any time a Heavy kills an enemy with the K.G.B he receives five seconds of guaranteed critical hits.

— Killing Gloves of Boxing publicity blurb

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The Killing Gloves of Boxing (K.G.B.) are an unlockable melee weapon for the Heavy. They appear as a pair of large, padded, team-colored boxing gloves.

These gloves deal the same damage on hit as the default Fists, but have a 20% longer swing time and thus less potential to follow up hits. When the Heavy kills an enemy with the K.G.B., however, he is guaranteed Critical hits for the next 5 seconds and can kill additional enemies with the weapon to refresh the boost's duration. This boost affects other weapons, allowing the Heavy to switch to other weapons such as the Shotgun to deal further damage at the cost of losing boost time through the switch animation.

The Killing Gloves of Boxing are automatically given to any player who obtains 22 Heavy achievements.

[Undocumented] Updated firing sounds for the Killing Gloves of Boxing.

Unused content

In the .gcf files, there is a scrapped weapon mechanic which was intended for the K.G.B. With it, every kill would earn the Heavy, and his surrounding allies, 50 health regenerated and an additional 10% to their critical hit chances. The downside was that the Heavy taunted after each and every successful K.G.B. kill.

Trivia

K.G.B. is the acronym for the Soviet security agency, secret police and intelligence agency Komityet Gosudarstvennoy Bezopasnosty, translated in English as "Committee for State Security," which was disbanded in 1991.

The K.G.B.'s taunt is a homage to Mr. Sandman's warm-up technique from Punch Out!!.

The Heavy achievementSupreme Soviet counts the critical boosts received by killed enemies with this weapon.